@a223123131
Thank you again very much for reporting this bug. Fixing it allowed simultaneously to already release the footnote start and end tag short code validation feature, scheduled for 2.3.0 but postponed with respect to the overdue status of the AMP compatibility fix (consisting in adding hard links with scroll offset based on the configuration already available for jQuery soft scroll offset), needing to be released before the end of the year 2020.
The lack of a footnote short code syntax check caused serious issues. Errors occur easily when very long content is edited under tough deadlines, as it happens in scientific publishing. An additional challenge is brought in by the lack of an easy and straightforward conversion utility generating WordPress conformant content out of documents created in word processors, especially in the .docx format. Ideally Footnotes would include that feature as a complementary service. Sadly the project is still far from shipping the complete solution.
Hence checking at least for balanced short codes is the bare minimum. Delaying the release of this feature was done in an attempt to space releases more out than in the last two months. The need of the bugfix that you pointed out solved the dilemma. Thanks.
