The hell is the arpeggio in this measure?

[Altissimo]

Hey everyone,
I'm working on another Hamtaro arrangement, this time of Sky Garden from Ham-Hams Unite. I have the majority of the song done, but as you can hear in the recording, the left hand is entirely sixteenth-note arpeggios spelling chords. There is one measure where I cannot for the life of me figure out what chord is accompanying the melody - the measure from 0:23-0:26.
MUS /MIDI / PDF of what I have. If you don't feel like looking at any of that, the entire piece is in E major, and the chords around the mystery chord are (as far as I know...), starting at 0:16: B7 - E - F#m - ? (has a C# as its highest pitch) - B7.

Assistance would much appreciated, I've spent far too long failing to figure out this single chord...

[InsigTurtle]

F#m7/C#
It's the same chord as in measure 7, just in a different inversion.

Just spelling it out just in case-> C# E F# A

EDIT: I guess you could also write it as A6/C#, but I prefer to write it as F#m7/C#

[Altissimo]

F#m7/C#
It's the same chord as in measure 7, just in a different inversion.

Yes, yes it is. Thank you!!

[SlowPokemon]

This wins my favorite thread title ever