As my report on bug with text wrapping in 2020 version (https://indesign.uservoice.com/forums/601180-adobe-indesign-bugs/suggestions/38998636-bug-with-world-ready-composer-when-use-space-like). Many of issues were fixed, but some still remain.
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Before going to the issue in the title of the post, I want to specify some issue that doesn’t fix form my last report. If you see on the attachment img 02, you will see the issue about text encoding (it just only my suspicion) that happen when you just copy and paste text (specifically in Thai) form 2020 version to 2019 or to another text editor. After I had pasted text into TextEdit almost vowels and tone marks were changed into quotation marks that which made me suspicious about text encoding in that language. (You can find .txt example download link in PS.)
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I do not know that this issue has a relative to the issue in question. The white spaces. As you can see in “img 01” in attachment (and on Indesign file) on the text where I high-lighted.
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First, you can see white space play as a character in the beginning of the line, like other white spaces such as thin-space. And you also see, when applied paragraph with Adobe World Ready Composer, either single line and paragraph, spaces other than whitespace that insert form space bar play as character on the end of the line when you apply text justify. In an example I shown to you, en-space did not collapse. It stilled as a character.
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Other than that, you can see the close parenthesis was sole wrapped into the next line, even it should stayed with the last word.
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Nearly half year, after you had claimed that Indesign support Thai, I still cloud’t update into 2020 version because of all these fatal issues.
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PS. You can download example Indesign file form https://www.dropbox.com/s/k08yqdio1cs3ttb/Test%20AW%20Folder.zip?dl=0
and you can download “Copy And Paste Text form Selection Text.txt” from https://www.dropbox.com/s/8sxrh3kzkagi0fm/Copy%20And%20Paste%20Text%20form%20Selection%20Text.rtf?dl=0