The thumbnail preview request returns 425 every time after the text file update. When postprocessing is active

[2403905]

Describe the bug

The thumbnail preview request returns 425 every time after the text file update.

Steps to reproduce

1. Create the file.txt, add some content, save and close it.

Expected behavior

Trigger the thumbnail preview request after the processing is finished.

Actual behavior

<?xml version="1.0" encoding="UTF-8"?> <d:error xmlns:d="DAV" xmlns:s="http://sabredav.org/ns"><s:exception></s:exception><s:message>File Processing</s:message></d:error>

Setup

 Infinite Scale

5.1.0-prealpha+dev
8.0.0-rc.1

OCIS_XXX=somevalue
OCIS_YYY=somevalue
PROXY_XXX=somevalue

Additional context

Add any other context about the problem here.

[AlexAndBear]

Note this is because file processing. We could try to load thumbnails again after processing finished event

[prohtex]

I've also noticed errors due to thumbnails being generated for 0B (empty) files.