  We investigate the massless scalar field perturbations of a new loop quantum
gravity motivated regular black hole proposed by Ashtekar {\it et al.} in
[Phys.Rev.Lett. 121, 241301 (2018), Phys.Rev.D 98, 126003 (2018)]. The
spacetime of this black hole is distinguished by its asymptotic properties: in
Schwarzschild coordinates one of the metric functions diverges as $r\to \infty$
even though the spacetime is asymptotically flat. We show that despite this
unusual asymptotic behavior, the quasinormal mode potential is well defined
everywhere when Schwarzschild coordinates are used. We propose a useful
approximate form of the metric, which allows us to produce quasinormal mode
frequencies and ringdown waveforms to high accuracy with manageable computation
times. Our results indicate that this black hole model is stable against
massless scalar field perturbations. We show that, compared to the
Schwarzschild black hole, this black hole oscillates with higher frequency and
less damping. We also observe a qualitative difference in the power-law tail of
the ringdown waveform between this black hole model and the Schwarzschild black
hole. This suggests the quantum corrections affect the behavior of the waves at
large distances from the black hole.
