`IsLagged` is always true in PSX with multitap (Octoshock)

Summary

I've started a number of tases with multitap enabled, (4 dual-analog controllers on port 1), and a memcard on slot1.
Both during normal gameplay and during TAStudio use all the frames are shown as lag frames.

TAStudio also mixes up what inputs to show/not show when prompted to do so on the setting of tastudio itself.

Repro

1. Open bizhawk
2. Open a psx rom
3. Open PSX-->Controller/Memcard Settings
4. Set 1 multitap on port 1, all 4 as dual analog controllers, and 1 memcard on port1
5. Open tastudio, start a tas from boot
6. All the frames will be shown as lag frames during gameplay

Edit: tested on 2.6.2 and 2.6.1, forgot to mention that

[TizianoMattei]

This issue happens when there is multitap enabled on port 1. Multitap enabled on port 2 works, with all kinds of controllers.

[TizianoMattei]

This issue is gone aswell using Nymashock!