I am guessing this is a Next-gen project. Classic projects will reveal the sub-tasks.
BTW, i did a quick search of jira.atlassian.com but did not find an issue reported on this. You might wish to provide feedback and/or contact Atlassian Support to see if they are aware and if not will open a request.
actually i created this issue so you can vote/watch - JRACLOUD-74495
if there is already an issue on this I'm sure they will close as a dup and reference the existing one.
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