It probably can, but you will likely have to contract a developer to fix it for you and then submit a Pull Request on GitHub to have it eventually fixed. The developers are evidently not doing anything to go back and fix bugs unless someone submits a PR with the fix already done.
(At least that is the response I got from @rmehta when I tried to get some attention on a v10 bug)
So even though v10 and v11 are supposedly still supported, that support is ONLY to include applying PRs that are already done and ready to merge. All of the Frappe team developers are evidently working on the new v12 stuff, but will merge bug fixes if they are provided by the community to v10 and v11.
BKM