Main thread issues

[alexisbronchart]

Hey, I'm using the picker from a SwiftUI view with the .emojiPicker modifier And I'm often getting these warnings (and even sometimes crashes I believe - I don't have a consistent way of repro this though) in MCEmojiPickerRepresentableController:

Log output:

Main Thread Checker: UI API called on a background thread: -[UIViewController presentedViewController]
PID: 34514, TID: 393139, Thread name: (none), Queue name: com.apple.root.user-initiated-qos.cooperative, QoS: 25
Backtrace:
4   TestApp                               0x000000010127f9fc $s13MCEmojiPicker0aB23RepresentableControllerV012updateUIViewD0_7contextySo0fD0C_7SwiftUI0fdC7ContextVyACGtF + 1756
5   TestApp                               0x000000010127fe50 $s13MCEmojiPicker0aB23RepresentableControllerV7SwiftUI06UIViewdC0AadEP06updategD0_7contexty0gD4TypeQz_AD0gdC7ContextVyxGtFTW + 60
6   SwiftUI                             0x00000001cce102a8 OUTLINED_FUNCTION_70 + 3324
7   SwiftUI                             0x00000001cd4f8254 OUTLINED_FUNCTION_73 + 15220
8   SwiftUI                             0x00000001cd4f818c OUTLINED_FUNCTION_73 + 15020
9   SwiftUI                             0x00000001cd4dac3c OUTLINED_FUNCTION_16 + 18920
10  SwiftUI                             0x00000001cd4f802c OUTLINED_FUNCTION_73 + 14668
11  SwiftUI                             0x00000001cd4f7e44 OUTLINED_FUNCTION_73 + 14180
12  SwiftUI                             0x00000001cd4f7084 OUTLINED_FUNCTION_73 + 10660
13  SwiftUI                             0x00000001cc2697f4 __swift_memcpy128_8 + 1020
14  AttributeGraph                      0x00000001b9d4f5c4 _ZN2AG5Graph11UpdateStack6updateEv + 504
15  AttributeGraph                      0x00000001b9d4fd54 _ZN2AG5Graph16update_attributeENS_4data3ptrINS_4NodeEEEj + 432
16  AttributeGraph                      0x00000001b9d5d8d0 _ZN2AG8Subgraph6updateEj + 828
17  SwiftUI                             0x00000001cd42b714 OUTLINED_FUNCTION_0 + 10564
18  SwiftUI                             0x00000001cd52e2f0 OUTLINED_FUNCTION_20 + 12920
19  SwiftUI                             0x00000001cc9bd640 OUTLINED_FUNCTION_76 + 964
20  libswiftObservation.dylib           0x000000020a7b8cc8 $s11Observation0A8TrackingV08_installB0_7willSet03didE0yAC_yACYbcSgAGtFZAC2IdOAC5EntryVXEfU_yyYbcfU2_TATm + 40
21  libswiftObservation.dylib           0x000000020a7b8d6c $sIegh_ytIeghr_TRTA + 20
22  libswiftObservation.dylib           0x000000020a7b7730 $s11Observation0A9RegistrarV7ContextV7willSet_7keyPathyx_s03KeyG0Cyxq_GtAA10ObservableRzr0_lFTf4dnn_n + 636
23  libswiftObservation.dylib           0x000000020a7b7c38 $s11Observation0A9RegistrarV7willSet_7keyPathyx_s03KeyF0Cyxq_GtAA10ObservableRzr0_lFTf4dnn_n + 56
24  libswiftObservation.dylib           0x000000020a7b274c $s11Observation0A9RegistrarV12withMutation2of7keyPath_q0_x_s03KeyG0Cyxq_Gq0_yKXEtKAA10ObservableRzr1_lF + 76
25  TestApp                               0x00000001017e70a8 $s8UserFeed0aB5ModelC12withMutation7keyPath_q_s03KeyG0CyACxG_q_yKXEtKr0_lF + 268
26  TestApp                               0x00000001017e2750 $s8UserFeed0aB5ModelC10activities18OrderedCollections0E10DictionaryVySS12CommonModels8ActivityVGvs + 200
27  TestApp                               0x00000001017e2964 $s8UserFeed0aB5ModelC10activities18OrderedCollections0E10DictionaryVySS12CommonModels8ActivityVGvM.resume.0 + 52
28  TestApp                               0x00000001017e6ce4 $s8UserFeed0aB5ModelC19loadActivityDetails3for12CommonModels0E0VSS_tYaKFTY2_ + 308
29  libswift_Concurrency.dylib          0x000000020a8b410c _ZN5swift34runJobInEstablishedExecutorContextEPNS_3JobE + 324
30  libswift_Concurrency.dylib          0x000000020a8b4fd4 _ZL17swift_job_runImplPN5swift3JobENS_11ExecutorRefE + 80
31  libdispatch.dylib                   0x000000010347536c _dispatch_root_queue_drain + 372
32  libdispatch.dylib                   0x0000000103475f18 _dispatch_worker_thread2 + 256
33  libsystem_pthread.dylib             0x00000001033937d8 _pthread_wqthread + 224
34  libsystem_pthread.dylib             0x00000001033925d4 start_wqthread + 8

Any idea where this could come from? Or what I could do to investigate this further?