Samsung Galaxy J7 Pro 2017 (SM-J730GM) doesn't seem to support partitioned SD cards

I have a Samsung Galaxy J7 Pro SM-J730GM purchased at a Sanborns shop in Mexico, running Telcel's stock ROM, rooted, with TWRP recovery and Link2SD. A couple weeks ago I repartitioned my SD card in order to use Link2SD's app linking function. I remember having to reboot my phone a couple times before it picked up the card, but at the moment I thought it had finally worked. However, apparently it was just a fluke, because today I restarted my phone in order to flash TWRP, and when I started my phone back it didn't detect the card anymore. The card is fine, as it can be read with no problems on a PC running Linux. The card reader is fine too, as the card is legible from TWRP and can be formatted without a hitch from Android. With that in mind, I tried formatting the card using my device's Set Up function, then I repartitioned it with my computer. When I inserted the repartitioned card, that's where my phone began refusing to mount it. Has anyone had any luck mounting a partitioned SD card on this model? Am I going to have to flash an aftermarket ROM into my phone? (PS: I'm going to try to reproduce it with a different card)