"exchars" may not be over 1200 (set to 1500) for users.
"exlimit" was too large for a whole article extracts request, lowered to 1.
HTML may be malformed and/or unbalanced and may omit inline images. Use at your own risk. Known problems are listed at https://www.mediawiki.org/wiki/Extension:TextExtracts#Caveats....