If you apply a class filed in TW 5.1.19 and before you get the CSS applied to tc-tiddler-frame In Tw 5.1.20pre it seems it has been changed!
Make below experiment in two TW as below
class: MistyRose
created: 20190708151308705
modified: 20190708151930578
tags: $:/tags/Stylesheet
title: New Tiddler
<style>
.MistyRose{background-color:#FFE4E1;}
</style>
! Test
Hi Mohammad
!! TW <<version>>
A tiddler to do the experiment is attached!
You got these different results
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New Tiddler.tid
Description: Binary data
