Only happens when leaves are adjacent to another tree with logs. (I have checked that I have fully chopped down the original tree before posting this as a bug).
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Duplicate of MC-135983, which has been marked as intended behaviour, as explained in a comment on that issue:
Indeed, as long as it's within a certain radius of a log, it won't decay, even if the log is of a different type.
And to further explain the reason behind this behaviour:
A tree is nothing more than a collection of blocks, not a single one of those blocks contains a "parent" property. Leaves only check their distance from wood/logs and decay if too far away. This has been the case since addition, and remained the case during their block state rewrite in 1.13.
Thank you for your report!
We're tracking this issue in MC-135983, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Invalid, modded game.
The leaves only check distance from nearest log; they don't have a sense of "my tree"; they're still in range of a correct wood type.