TrueNAS upgraded and now IIS Express won't work from SMB share even with ACL set correctly

Hello All,
Recently I upgraded my TrueNAS to the latest version and following this step, I went through and cleaned up the various shares and ACL’s according to needs. Unfortunately, since then, I’ve been unable to “Preview in browser” my web development sites which IIS Express normally shared from my development SMB share.

IIS Express runs using my normal windows user account; this account can read and modify files.
I tested IIS Express to serve up a plain HTML file within the same site and this worked as expected.
When I try to server a .aspx file, I get either a 403.1 or (more commonly) 403.3 error indicating that an ACL condition is preventing the file being served.

The permissions on the SMB share its self are quite simply - everybody / full-control.
The underlying dataset is where the ACL permissions are defined; this dataset is configured for NFSv4/SMB ACL type and the ACL is configured with my windows username and “Full Permissions”.

I’m suspecting that, for whatever reason, the ‘execute’ permission is not being served and this is resulting in the error I’m getting. But, no matter what I configure, I cannot seem to get it to work.

Has anyone else encountered this condition and if so, do you know of a fix?

Thank you!