Hello,
I tested in 2 environments, 1 is 2020R1 Build 20.105.0024, the other is 2020R2, Build 20.203.0028.
Both meet the same errors.
The report (AR672000 ) is running correctly, however, if I want to do a little modification and open the report from server, it shows errors in report designer, some like “textbox75” is duplicated stated, totally 4 errors, including “textbox75”,textbox76,textbox79,textbox80.

If I did nothing, no changes, and just save this opened file back to server,
it won’t display well, while it did display well before save this rpx back.
So my large guess is the file is broken when opening.

The line with doc.type= INV is missing data. which it did display data before.
Can someone help me out?