As we said when it was announced that a new Confluence 11 major version was coming:
If 11.x requires us to add a third build, we’ll have to seriously consider whether it’s worth continuing to offer DC versions given the dwindling expected sales.
The same sentiment applies here.
If this materially increases the amount of effort we must spend supporting future versions of DC products, then we will simply sunset our DC app offerings at the last supported version prior to the breakage.
This would purely be a business decision, as it makes little sense to continue to invest in a product that is ~2.8 years away from EoL, where the existing customer base is actively planning migrations away from the platform (either to Cloud, or away from Atlassian entirely).
I would urge you to consider whether this juice is truly worth the squeeze.