After upgrading to version 220.127.116.11 there are some missing formatcodes in Libre Office Math (for ex. %phi). I didn't finde out all of them.
You can put them into the formular editor using the special character dialogue. But this is annoying.
I tryed the Linux Ubuntu version and the Windows version.
Thank you for the report.
This was however previously reported in
Bug 80650 - lower case greek alphabet missing in localized Math symbol table
w<here you can find also a workaround.
I set Status to Duplicate.
*** This bug has been marked as a duplicate of bug 80650 ***