the process I've used for flashing monthly updates are
1. fastboot OTA img. Lineage is different.
2. fastboot twrp img
3. flash twrp zip
4. flash a kernel
5.flash magisk last
but Lineage is probably different since its a zip but like the OP said you are still flashing a boot img so maybe the order is wipe stock rom in twrp, flash lineage, then flash twrp zip and finally flash magisk before initial boot but i could be wrong
1. fastboot OTA img. Lineage is different.
2. fastboot twrp img
3. flash twrp zip
4. flash a kernel
5.flash magisk last
but Lineage is probably different since its a zip but like the OP said you are still flashing a boot img so maybe the order is wipe stock rom in twrp, flash lineage, then flash twrp zip and finally flash magisk before initial boot but i could be wrong
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