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Its not clear if equipment would be created

Does the True Polymorph spell form a creature with equipment? discusses if you can or cannot create equipment, with answers highly upvoted on both sides of the fence. Normal polymporph has this problem less often, because the normal beast stat blocks typically have no equipment, but could you polymorph, for example, into an armored sabre-tooth tiger, if you had seen such a beast, i.e. a sabre-tooth tiger in armor (like the one in Curse of Strahd)? The same goes for creatures that have been modified, for example by losing a limb. If you polymorph into that creature, will you have all the limbs? I think this is up to the DM. Equipment is listed as part of the creatures statistics, but stated designer intend is that it would not be copied.

It's not clear if equipment would be created

Does the True Polymorph spell form a creature with equipment? discusses if you can or cannot create equipment, with answers highly upvoted on both sides of the fence, so I think this is probably best left to the DM to decide. Normal polymorph has this problem less often, because the normal beast stat blocks typically have no equipment, but could you polymorph, for example, into an armored sabre-tooth tiger, if you had seen such a beast, i.e. a sabre-tooth tiger in armor (like the one in Curse of Strahd)?

The Monster Manual says on page 6:

The Monster Manual says on page 6:

Polymorph refers to a creatures given statistics

In summary, modified statistics are also statistics; polymorph as written does care about statistics, not stat blocks, and does not stop you from copying an individual creature's statistics. So you could copy a modified beast, and it would be up to the DM if that process also copies things like equipment of the target.

A monster’s statistics, sometimesw referred to as its stat block, provide the essential information that you need to run the monster.

From the game's perspective, statistics are recorded or formatted in a stat block (or character sheet). If you modify them, you again could print the new ones as a stat block.

Polymorph refers to a beast's given statistics

In summary, modified statistics are statistics; polymorph as written does care about statistics, not stat blocks, and does not stop you from copying an individual creature's statistics. So you could copy a modified beast, and it would be up to the DM if that process also copies things like equipment of the target.

A monster’s statistics, sometimes referred to as its stat block, provide the essential information that you need to run the monster.

From the game's perspective, statistics are recorded or formatted in a stat block (or character sheet). If you modify them, you again could print the new ones as a new stat block. Or you can record them as changes to a pre-existing stat block that you reference.