I’ve mentioned this before in other posts, but though it simpler just to create a new Topic. Using Khmer Angkor sometimes I cannot type any character that requires right alt: ឝ ឞ ៖ Other times it is fine. Previously it happened in Flex, just now on libre writer (6.1.5). Restarting libre office did not fix it. Restarting the computer did fix it. Will let you know if it happens in other programmes.