UserAgent: Mozilla/5.0 (X11; CrOS x86_64 10452.99.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.203 Safari/537.36
Platform: 10452.99.0 (Official Build) stable-channel sentry

Steps to reproduce the problem:
1. In Files app, rename a directory with Ctrl-enter, OR:
2. move a directory with Ctrl-x then Ctrl-v
3. 

What is the expected behavior?
1. Directory name should change, but timestamp shouldn't
2. Directory should appear elsewhere, but timestamps of directory and all subdirectories shouldn't change, at least if the move was within the same partition

What went wrong?
In both 1. and 2. the timestamps are updated. Not only that, but the timestamps are recursively updated for all subdirectories (quite amazing for a simple rename.)

OTOH, when the directory is merely COPIED (Ctrl-c, then Ctrl-v), the timestamps are (properly) unchanged.

Did this work before? Yes Known to work in Dec 2017. Possibly still working later; not sure about when it went wrong

Chrome version: 66.0.3359.203  Channel: stable
OS Version: 10452.99.0
Flash Version: 29.0.0.171 

.zip file attached with 2 screenshots. First shows Files App with directory 'bug'. Second shows Files App and directory after renaming 'bug' to 'buglater'. Notice the timestamps.
 

Deleted: Chromebugs.zip 97.5 KB

Chromebugs.zip 97.5 KB Download