Cannot set "cover" value for vehicle actions

[TheGiddyLimit]

A "Cover" column is displayed under vehicle Features -> Actions, but there is no UI to set this value.

The MountableTemplate data model, which includes the cover field, is only mixed into weapon/equipment-type items, but neither of these allow the field to be set in the UI. Additionally, each of these have their own sheet header, neither of which have a "cover" column.

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Exporting a working actor from dnd 3.3.1:

but when imported into dnd 4.1.2:

blanks the "Cover" display, and when exported from 4.1.2, the "cover" field is missing from the resulting JSON.

JSON exported from 3.3.1:

fvtt-Actor-test-vehicle-PaPE3J59L6Wcq8NN.json

JSON exported from 4.1.2:

fvtt-Actor-test-vehicle-T0Nk9Ntj3G34tDCY.json

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Env:

• dnd5e 4.1.2
• Foundry 12.331
• no modules active