Alter Field does not alter the field when changing case in field name

[BrandonFlessner]

I am trying to use the Alter Field geoprocessing tool to change a field name of a feature glass in a geodatabase. I'm trying to change the field from Total_Mdollars to Total_MDollars. The tool completes "successfully" but the field name remains unchanged. Anyone else having this issue? I think its a bug. The field contains values but according to the docs this should not matter when changing the field name.  I've tried it in Pro, ArcMap 10.5.1, and via Python. 

[Asrujit_SenGupta · Accepted solution]

NIM101810: Altering field names from uppercase to lowercase or .. 

Seems to be an existing Bug..

[BrandonFlessner]

Thanks Asrujit, I'm glad to know that I wasn't making a silly mistake. Interesting to know that it has existed since 10.2.1 and has not been fixed in 3.5 years!!  #jack dangermond‌

[RebeccaStrauch__GISP]

Trying to rename a file or folder even in windows explorer will have issues and not change.  A work around of course is to change it two times.  Something like

   Total_Mdollars to Total_MDollars1  then

   Total_Mdollars1 to Total_MDollars

Not ideal, but at least workable.