i was trying to use the bucket tool to do some quick block color fills (v. 2019) and areas were filling in that were obviously contained by thick linework.
after much testing and settings, i finally realized that the file's edge is considered as 'open'. Please change it to where file's edge is also considered a 'closed path'.
the attached image illustrates my issue.
update: the desired results can be achieved if i use a pencil; but cannot if i used a brush from 'thick paint'