In 1.21.2 and 1.21.3 it was possible to create item_model like bow_pulling or armor trims model. However, this is no longer possible in the recent snapshot without a Resource Pack.
Example below
/give @p bow[item_model=bow_pulling_1]
The item now appears missing texture
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is duplicated by 1
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Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
Please note, that mechanics of the game may change between updates.
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This is not really a bug, the whole definition of item_model changed, and unintended results (such as selecting incomplete models) were made impossible by design.