The closest I could find for you were these two devices, Mini DisplayPort to HDMI® (2x HDMI® Output) Converter w/ Audio and Zotac ZT-MDP2HD Mini DP to Dual HDMI Cable. Of course, that isn't to say there is no multi-output HDMI Thunderbolt peripheral (a single Thunderbolt cable to a device with multiple HDMI ports), it may exist as it is possible, I just haven't seen one. This could be the reason for only one of your HDMI ports working as the built in one would most likely be positioned after the Mini DP connection. Apple also says here that if you have a Thunderbolt chain, the Mini DP connection should come last. USB Type C to HDMI Adapter, Tuwejia 4K USB C HDMI Video Output No Setting Required Conversion Connector Compatible with Thunderbolt 3 MacBook Pro/MacBook. Since there is no power source to an adaptor, there is no point making a Thunderbolt to HDMI connector when Mini DP is (for all intents and purposes) the same thing. The actual daisy chaining that goes on inside Thunderbolt devices is done within the device itself and would require a power source to power it. Unfortunately, from what I have been able to see, and from my product knowledge working at an iStore, there is no Thunderbolt to HDMI, only Mini DP. Of course, Mini DP doesn't have the same power behind it (in that it doesn't combine with PCIe) as Thunderbolt so you can't daisy chain them. I assume this was done for backwards compatibility with older hardware that was Mini DP (so you could use an Apple Cinema Display on a newer model MacBook Pro, for example). Thunderbolt is essentially a combination of Mini DisplayPort and PCIe.
Mini DisplayPort and Thunderbolt are essentially the same connection, just with different hardware controlling them.
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