Fill&Sign/ Adobe Sign produce infinite chain of did close - did save events which leads to crash.

Acrobat, Reader v. - 2020.012.20043 and 2020.012.20048
I'm developing add-in for Acrobat/Reader and with versions mentioned above when I try to sign document via Fill & Sign or Adobe Sign Adobe starts to produce infinite set of events and eventually crashes.

Chain of events: 
PDDocDidSave

PDDocWillClose
PDDocDidClose
PDDocDidSave

PDDocWillClose 

PDDocDidClose

These set of events occurs few times and Acrobat/Reader application crashed.
This is not happened before and reproduces on old my plug-in builds.