Buffer UGen channel mismatch: expected 2, yet buffer has 1 channels

[vin-ni]

Getting an error since the recent updates:
Buffer UGen channel mismatch: expected 2, yet buffer has 1 channels

Any ideas @capital-G ?
Or is this M1 only?

gencaster-sound-1        | sclang.log:	sclang_1.log:	FINISHED	d0f036ba-9f2f-4c1a-bd19-b7c84a4c6d9f	( 'return_value': 1594.729795292, 'status': FINISHED, 'uuid': d0f036ba-9f2f-4c1a-bd19-b7c84a4c6d9f )
gencaster-sound-1        | sclang.log:	sclang_1.log:	RECEIVED	5d575616-844c-4693-813c-091e313daf2c	( 'status': RECEIVED, 'uuid': 5d575616-844c-4693-813c-091e313daf2c )
gencaster-sound-1        | sclang.log:	sclang_1.log:	Execute now: '{g.playBuffer("/data/audio_files/PinkPanther30_CuYaIsH.wav")}'
gencaster-sound-1        | sclang.log:	sclang_1.log:	FINISHED	5d575616-844c-4693-813c-091e313daf2c	( 'return_value': GenCasterServer.new, 'status': FINISHED, 'uuid': 5d575616-844c-4693-813c-091e313daf2c )
gencaster-sound-1        | sclang.log:	sclang_1.log:	RECEIVED	ed7aab09-05dd-41d8-b262-bc08e73fcb86	( 'status': RECEIVED, 'uuid': ed7aab09-05dd-41d8-b262-bc08e73fcb86 )
gencaster-sound-1        | sclang.log:	sclang_1.log:	Execute now: '4.0.wait;'
gencaster-sound-1        | sclang.log:	sclang_1.log:	Buffer UGen channel mismatch: expected 2, yet buffer has 1 channels
gencaster-sound-1        | sclang.log:	sclang_1.log:	RECEIVED	cd3b2933-19f9-495a-a482-07fabf606a7e	( 'status': RECEIVED, 'uuid': cd3b2933-19f9-495a-a482-07fabf606a7e )
gencaster-sound-1        | sclang.log:	sclang_1.log:	Execute now: 'Ndef("ready".asSymbol, 1.0);'
gencaster-sound-1        | sclang.log:	sclang_1.log:	FINISHED	cd3b2933-19f9-495a-a482-07fabf606a7e	( 'return_value': Ndef('ready'), 'status': FINISHED, 'uuid': cd3b2933-19f9-495a-a482-07fabf606a7e )
gencaster-sound-1        | sclang.log:	sclang_1.log:	late 0.646085001
gencaster-sound-1        | sclang.log:	sclang_1.log:	RECEIVED	13c7dd1f-4756-4d14-bf48-99eae26c48ba	( 'status': RECEIVED, 'uuid': 13c7dd1f-4756-4d14-bf48-99eae26c48ba )
gencaster-sound-1        | sclang.log:	sclang_1.log:	Execute now: 'Ndef("ready".asSymbol, 1.0);'
gencaster-sound-1        | sclang.log:	sclang_1.log:	FINISHED	13c7dd1f-4756-4d14-bf48-99eae26c48ba	( 'return_value': Ndef('ready'), 'status': FINISHED, 'uuid': 13c7dd1f-4756-4d14-bf48-99eae26c48ba )
gencaster-sound-1        | sclang.log:	sclang_1.log:	late 0.656748120
gencaster-backend-1      | 2023-09-22 00:46:56,708 - DEBUG - engine:get_next_node - Choose exit Start: output_default on Start
gencaster-backend-1      | 2023-09-22 00:46:56,838 - DEBUG - engine:execute_node - Executing node dd16d33f-ac89-46fd-b89f-bec7c6a69521
gencaster-backend-1      | 2023-09-22 00:46:56,861 - DEBUG - engine:execute_audio_cell - Run audio cell 50a49044-e7dc-4359-a132-0c6618c3ea19
gencaster-backend-1      | 2023-09-22 00:46:56,934 - DEBUG - engine:wait_for_finished_instruction - Wait for finished instruction 32f5ed70-537f-46c5-a93b-55302934bcce
gencaster-backend-1      | INFO:     172.18.0.1:65302 - "POST /graphql HTTP/1.1" 200 OK
gencaster-sound-1        | sclang.log:	sclang_1.log:	FINISHED	ed7aab09-05dd-41d8-b262-bc08e73fcb86	( 'return_value': 1599.407608044, 'status': FINISHED, 'uuid': ed7aab09-05dd-41d8-b262-bc08e73fcb86 )
gencaster-sound-1        | sclang.log:	sclang_1.log:	RECEIVED	32f5ed70-537f-46c5-a93b-55302934bcce	( 'status': RECEIVED, 'uuid': 32f5ed70-537f-46c5-a93b-55302934bcce )
gencaster-sound-1        | sclang.log:	sclang_1.log:	Execute now: '{g.playBuffer("/data/audio_files/PinkPanther30_CuYaIsH.wav")}'
gencaster-sound-1        | sclang.log:	sclang_1.log:	FINISHED	32f5ed70-537f-46c5-a93b-55302934bcce	( 'return_value': GenCasterServer.new, 'status': FINISHED, 'uuid': 32f5ed70-537f-46c5-a93b-55302934bcce )
gencaster-sound-1        | sclang.log:	sclang_1.log:	RECEIVED	99087dba-c4a7-4c3c-844e-849f956a93c7	( 'status': RECEIVED, 'uuid': 99087dba-c4a7-4c3c-844e-849f956a93c7 )
gencaster-sound-1        | sclang.log:	sclang_1.log:	Execute now: 'Ndef("ready".asSymbol, 1.0);'
gencaster-sound-1        | sclang.log:	sclang_1.log:	FINISHED	99087dba-c4a7-4c3c-844e-849f956a93c7	( 'return_value': Ndef('ready'), 'status': FINISHED, 'uuid': 99087dba-c4a7-4c3c-844e-849f956a93c7 )
gencaster-sound-1        | sclang.log:	sclang_1.log:	late 0.521095018
gencaster-sound-1        | sclang.log:	sclang_1.log:	Buffer UGen channel mismatch: expected 2, yet buffer has 1 channels