After updated to the newest Indesign 2020, word cut/ hyphenate in Thai language become incorrect.
The fix for this issue is now available in the latest update of InDesign – that is, InDesign 15.0.2.
Please update your InDesign application to get this fix.
Adobe InDesign team
new issue with Thai language found since version 15.1
sometime Indesign put blank space in the front on line not at line ending.
I, and all of my co-workers, also have faced the same issue. Everything about word wrapping in Thai language goes wrong after updated to 2020 version. This never happen in the former versions. I don't understand why this issue is happen. Even if I use Discretionary Line Break to help Indesign to wrap text properly. But It is not productive at all, because I had been forced to read text all over again and to insert Discretionary Line Break to every lines. So please fix it.
PS. In attachment, I attach some of instance that show what is happen. In this instance I use paragraph style that set language to Thai and use world ready single line composer to compose the text.