Not a great workaround, but I am able to get three external monitors by connecting 2 display port monitors (HDMI monitors using a DP to HDMI adapter) to the Dell dock connected to one USB-C port and then plug the third HDMI monitor (through a cheap Amazon USB-C dock) to the other USB-C port.
Works on my M2 Macbook Air, but uses both USB-C/Thunderbolt ports. (Ventura)
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