Well, then it is a recent change, 5.3.8.1 came out the same day as 5.3.8 due to bugs that needed fixing. To be honest, I gave up on using field names for sub fields a long time ago so it may be another reason I haven’t notices, I almost always use the field key. The field names you’ve mentioned have always been there (or been there long enough that I can’t remember them being different) when using filters like load_field and load_value. It could be that the way they are now was something that’s been overlooked and may have been causing other issues, honestly, I don’t know, just guessing 🙂 I do know that the “_name” index has been there as long as I can remember though.
