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The optional rule from Xanathar's won't let you choose the order

This rule states:

In rare cases, effects can happen at the same time, especially at the start or end of a creature's turn. If two or more things happen at the same time on a character or monster's turn, the person at the game table - whether player or DM - who controls that creature decides the order in which those things happen.

This optional rule only applies when things happen at the same time on a character or monster's turn. So strictly reading it, this can't be applied at all because there are no turns when short resting. Thus there is no rule (optional or otherwise) about ordering these events.

It is up to the GM how these are ordered

However, the events of "Spending Hit Dice" and "Attuning" are certainly both happening at the same time (they are both triggered "at the end of a short rest"). Maybe your GM will allow you to determine the order, maybe they won't. Lacking any rules, it is up to them to decide.

With a strict reading, the optional rule from Xanathar's won't let you choose the order

This rule states:

In rare cases, effects can happen at the same time, especially at the start or end of a creature's turn. If two or more things happen at the same time on a character or monster's turn, the person at the game table - whether player or DM - who controls that creature decides the order in which those things happen.

This optional rule only applies when things happen at the same time on a character or monster's turn. So strictly reading it, this can't be applied at all because there are no turns when short resting. Thus there is no rule (optional or otherwise) about ordering these events.

It is up to the GM how these are ordered

However, the events of "Spending Hit Dice" and "Attuning" are certainly both happening at the same time (they are both triggered "at the end of a short rest"). Maybe your GM will allow you to determine the order, maybe they won't. Lacking any rules, it is up to them to decide. The GM may even allow the Xanathar's rule to apply during short rests; it's already an optional rule after all and whether it should only apply during combat is a different question entirely.

The optional rule from Xanathar's won't let you choose the order

This rule states:

In rare cases, effects can happen at the same time, especially at the start or end of a creature's turn. If two or more things happen at the same time on a character or monster's turn, the person at the game table - whether player or DM - who controls that creature decides the order in which those things happen.

This optional rule is meant to apply to combat and in fact, the rule technically only applies when things happen at the same time on a character or monster's turn. So strictly reading it, this can't be applied at all and so there is no rule (optional or otherwise) about ordering these events.

It is up to the GM how these are ordered

However, the events of "Spending Hit Dice" and "Attuning" are certainly both happening at the same time (they are both triggered "at the end of a short rest"). Maybe your GM will allow you to determine the order, maybe they won't. Lacking any rules, it is up to them to decide.

The optional rule from Xanathar's won't let you choose the order

This rule states:

In rare cases, effects can happen at the same time, especially at the start or end of a creature's turn. If two or more things happen at the same time on a character or monster's turn, the person at the game table - whether player or DM - who controls that creature decides the order in which those things happen.

This optional rule only applies when things happen at the same time on a character or monster's turn. So strictly reading it, this can't be applied at all because there are no turns when short resting. Thus there is no rule (optional or otherwise) about ordering these events.

It is up to the GM how these are ordered

However, the events of "Spending Hit Dice" and "Attuning" are certainly both happening at the same time (they are both triggered "at the end of a short rest"). Maybe your GM will allow you to determine the order, maybe they won't. Lacking any rules, it is up to them to decide.

The optional rule from Xanathar's won't let you choose the order

This rule states:

In rare cases, effects can happen at the same time, especially at the start or end of a creature's turn. If two or more things happen at the same time on a character or monster's turn, the person at the game table - whether player or DM - who controls that creature decides the order in which those things happen.

Now, it obviously is meant to apply to combat and in fact, the rule technically only applies when things happen at the same time on a character or monster's turn. So strictly reading it, this can't be applied at all and so there is no rule (optional or otherwise) about ordering these events.

It is up to the GM how these are ordered

However, the events of "Spending Hit Dice" and "Attuning" are certainly both happening at the same time (they are both triggered "at the end of a short rest"). Maybe your GM will allow you to determine the order using this already optional rule, maybe they won't. Lacking any rules, it is up to them to decide.

At my own tables, I would absolutely let my players benefit from a Periapt of Wound Closure they had just attuned to. The alternative is that they have to awkwardly rest again in order to benefit from it. At this point things would already be well within my wheelhouse, and any shenaniganry resulting from this ruling could be removed with another houserule.

The optional rule from Xanathar's won't let you choose the order

This rule states:

In rare cases, effects can happen at the same time, especially at the start or end of a creature's turn. If two or more things happen at the same time on a character or monster's turn, the person at the game table - whether player or DM - who controls that creature decides the order in which those things happen.

This optional rule is meant to apply to combat and in fact, the rule technically only applies when things happen at the same time on a character or monster's turn. So strictly reading it, this can't be applied at all and so there is no rule (optional or otherwise) about ordering these events.

It is up to the GM how these are ordered

However, the events of "Spending Hit Dice" and "Attuning" are certainly both happening at the same time (they are both triggered "at the end of a short rest"). Maybe your GM will allow you to determine the order, maybe they won't. Lacking any rules, it is up to them to decide.