What settings do you have in GIMP 2.8 for “Preferences/Color Management/File Open behaviour” and for “Preferences/Color Management/RGB Profile”? I have these Preferences set to “Ask what to do” for “File Open behaviour” and to “None” for the RGB Profile.
To replicate your steps, I used GIMP-2.9 to save a test file to disk with “sRGB-elle-V4-srgbtrc.icc” as the embedded ICC profile. When I used 2.8 to open the test file, GIMP-2.8 asked whether or not to keep the embedded profile. Opting to keep the selected profile did result in “Image Properties” showing “sRGB-elle-V4-srgbtrc.icc” as the embedded ICC profile.
As an aside, in GIMP-2.9, the built-in sRGB profile and my “sRGB-elle-V4-srgbtrc.icc” are identical. However, for GIMP 2.9 (I mean default GIMP 2.9, not my CCE version, which has its own very different set of color management issues), sometimes editing images that aren’t in the built-in sRGB color space can cause various issues and/or result in new profiles being created and assigned to the image.
I would suggest that as soon as you import into GIMP-2.9 an image file that’s in the “sRGB-elle-V4-srgbtrc.icc” color space, the first step should be to assign GIMP-2.9’s built-in sRGB color space. This will not change the image colors at all (if it does, there’s a problem somewhere!).
Then when you are finished editing and you want to export a file to disk, re-assign “sRGB-elle-V4-srgbtrc.icc” before exporting the file to disk. This way you side-step any new profiles that GIMP-2.9 might have created.