My fill shapes are automatically turned into stroke outline shapes after pasting, after restarting, after updating to the latest Indesign, and in a new document and in the same document in Indesign 18.2.1. See image capture of my shape before: Copy and after: Paste.
Are you using object styles or did you modify the Basic Graphic Frame object style? If you have an object style applied to something you copied and there is a style with the same name in the target document the target document’s style will be applied.
Say you have the style Figure in your Document A which uses a grey fill and no stroke. In Document B there is also a style Figure which has a while fill and a black stroke. Copy something using the Figure style from Document A and paste it into Document B. It wil have a white fill and a black stoke. When pasted items don't look like you expect the first thing to check for is inconsistent styles.
Correction! It does NOT paste with the automatic-change from fill to stroke in the SAME document. Sorry for adding this wrong info in the post/reply and I can't delete it.
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