In the Composite Font Editor, I defined a custom character set that includes all of the characters in Noto Sans Thai and tried specifying various Thai fonts to that character set as part of a composite font.

However, regardless of the font I specified and regardless of what fonts I specified for the other parts of the composite font in certain circumstances three Thai tone characters would not display (U+0E48, U+0E49, and U+0E4C). As far as I can tell, they do display when they are above another tone character, but they do not display if they are the only tone character. I have confirmed that these characters are included in the custom Thai character set that I defined.

I attached a PDF showing most of the characters in the custom Thai character set I defined and one of many composite font definitions that I tried.

InDesign 14.0.2 (same thing happens in other versions) on Windows 7 (64-bit)