several warnings per second appear in application output:

[WARN | qt.qpa.wayland.backingstore | c.t.cluster] Delivering update request through fallback timer, may not be in sync with display

[WARN | qt.qpa.wayland.backingstore | c.t.cluster] Delivering update request through fallback timer, may not be in sync with display

[WARN | qt.qpa.wayland.backingstore | c.t.cluster] Delivering update request through fallback timer, may not be in sync with display

[WARN | qt.qpa.wayland.backingstore | c.p.hud] Delivering update request through fallback timer, may not be in sync with display

[WARN | qt.qpa.wayland.backingstore | c.p.music] Delivering update request through fallback timer, may not be in sync with display

[WARN | qt.qpa.wayland.backingstore | c.p.music] Delivering update request through fallback timer, may not be in sync with display

[WARN | qt.qpa.wayland.backingstore | c.p.music] Delivering update request through fallback timer, may not be in sync with display

[WARN | qt.qpa.wayland.backingstore | c.p.music] Delivering update request through fallback timer, may not be in sync with display

[WARN | qt.qpa.wayland.backingstore | c.p.music] Delivering update request through fallback timer, may not be in sync with display

[WARN | qt.qpa.wayland.backingstore | c.t.cluster] Delivering update request through fallback timer, may not be in sync with display