A while back there was some issue with the wildcard expansion generating excessively long URLs that would be rejected by the web server. Jeff imposed an expansion limit as a workaround, which seems to limit the wildcard matches to the top 20 most popular applicable tags.
This is by design and is a recent change.
The syntax you see inserts the image and creates a link to the image. This way images that are larger than the column for posts can be scaled down in the post but the full version of the image is easily gotten to.
The syntax to do that has been around for a long time, it's just that the image button was recently ...
There are a handful of redundant phrases - including some containing the name of the tag itself - that are not displayed on tags list, to help ensure there's room for the non-redundant parts of the tag excerpt.
The google spreadsheets tag wiki doesn't match any of these, so it's displayed in full.
For details, see: New tags page mangles tag wiki excerpts
The decision whether this error is rendered is made on the server when the add comment link is rendered (it has an additional data-reg="true" attribute), since it also depends on other things that would require an additional round-trip to the server each time a user clicks this button - which we don't want.
After you've reached the required rep you need to ...
There are always some number of rendering inconsistencies between the mobile and desktop versions of Chrome, even if you're not using any beta versions.
That's why we have a mobile version of the site, accessible via the "mobile" link in the footer - I can confirm that the table (while indeed poorly-rendered in the full site on mobile Chrome) appears ...
Your text entry is expected to be mandatory and supplemental (and in my case it's always has been so) to the sentence stub.
The comment box, on the other hand, is optional and hence the placeholder text to guide. I'm not sure I see the reason why the predefined offtopic comment should be changed to placeholder type?
What seems to have happened is that the suggested edit was looked at - the reviewer decided to improve it but also unselected the checkbox for "this edit was helpful", causing the suggested edit to be rejected, but also for your changes to be incorporated into his edit.