For users of Apache ACME (mod_md) who have problems with old clients, I wrote a description and a fix you can install:
NOTE: this fix will mean your sites will no longer be accessible on old Android devices. But it will work on broken clients that have a recent CA root store. As you will have discovered by now, you have to choose one evil over another.
Just to be clear: if you only care about modern clients, there is nothing to do.
Hope this helps,