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@maxim_k wrote:
AutoCAD 2020 cannot find drawing with block, because this drawing is inside iCloud Drive folder.

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After additional testing I figured out that I was wrong about this bug. In fact it is not related to iCloud Drive.

But the bug related to new (in 2020 version) Blocks palette exists.

Here is the description of this bug:

If you add drawing to the library as whole drawing by selecting an option from this alert:

you cannot use such block (insert block from blocks library tab).

But if you select an option to add multiple blocks from the drawing - everything works fine.

As a side effect - because of this bug you cannot add drawing which contains no blocks to Blocks Library (in such case the drawing itself becomes a block).