In addition to @sindy’s first post in RouterOS bridge mysteries explained referenced by @mkx, you should read the thread Slow Hex file transfer speed, the discussion of frame-types starts with post #7 and goes through post #18.
I have never gotten any feedback from those posts, so perhaps my interpretation is incorrect, but my experiments seem to agree with my interpretation. Note that I made modification to what @sindy said in the first post of bridge mysteries, and I generally take what @sindy and @mkx say with higher confidence than general posts, so consider the source.
Some day when I get time, I should create a post with configs from an RB5009 as a router with a single non-bridge port configured as a hybrid trunk port connected to an RB760iGS (hEX S) configured as a switch, the same config using an RB260GS (CSS106-5G-1S) SwOS switch in place of the hEX S, and then do the same thing using only the RB5009 bridge and bridge-ports. In other words, a sort of MikroTik vlan rosetta stone. But doing that properly will take multiple hours (at least for me). If I was going to do that, I would probably also show the same config using several other vlan-aware switches I have as well (NetGear GS908E, TP-Link TL-SG108E, TP-Link TL-SG2008 V3), but probably wouldn’t post those configs here (may be put it on Tom Lawrence’s forum, which is more vendor agnostic). For a “rosetta stone” with 3 common consumer “smart switches”, you can watch Doug Johnson Productions VLANs Part 2 - Configuring Three Ethernet Switches