Steps:
# occurs for me on firefox, chrome, and IE browsers (so far)
# visit https://www.mediawiki.org/wiki/Extension_talk:TableEdit
# log in if not already logged in
# enter edit mode on an existing topic
# click in the empty line at the end of the topic
# hit backspace to remove the empty line
# save your changes by clicking "Publish Changes" button.
# click publish again, in the summary window, without adding a comment.
# page is now in read-mode. notice the tabs-- you're on the "Read" tab.
# check the address bar-- "action=edit" is STILL unexpectedly in the address bar.
# do a browser-refresh (CTRL-r on Chrome)
# page will unexpectedly re-enter edit-mode.
also occurs for me on https://www.mediawiki.org/wiki/API_talk:Import
plz test.
(Note, if "Stalled" means the OP has not provided complete information, this task isn't stalled.)