Applications must be tapped several times for their surface to show

With a fresh guppy/master build, when I tap on an application on the homescreen (e.g. mixer), it doesn't show immediately. `afm-util ps` confirms that the application is running but the surface doesn't show up. Tapping again usually shows the application but sometimes I have to do it several times.

To go back to the homescreen, I have to tap the "launcher" icon on the top twice, too. And opening a new app, or going back to an open one, forces me to tap several times again.

Build Configuration:
BB_VERSION = "1.36.0"
BUILD_SYS = "x86_64-linux"
NATIVELSBSTRING = "universal"
TARGET_SYS = "aarch64-agl-linux"
MACHINE = "m3ulcb"
DISTRO = "poky-agl"
DISTRO_VERSION = "6.99.3+snapshot-20190116"
TUNE_FEATURES = "aarch64"
TARGET_FPU = ""
SOC_FAMILY = "rcar-gen3:r8a7796"
meta-rcar-gen3 = "HEAD:5a8179db2274386c318591d1b693cd104286f7dd"
meta-rcar-gen3-adas = "HEAD:235b2160ca1e11afeda9f9ed017f715199720756"
meta-qt5 = "HEAD:d8b531530fa42b59aa0a5b123d87a30d749cbcc4"
meta-agl-profile-graphical-qt5
meta-agl-profile-graphical
meta-netboot = "HEAD:235b2160ca1e11afeda9f9ed017f715199720756"
meta-html5-framework
meta-hmi-framework
meta-audio-4a-framework = "HEAD:4a6461a2a52c842efe1b9df668809385ab657b2d"
meta-agl-demo = "HEAD:220104e57bdebd2d8e1b71c19c6f961fc9187a57"
meta-oe
meta-multimedia
meta-networking
meta-python
meta-filesystems = "HEAD:eae996301d9c097bcbeb8046f08041dc82bb62f8"
meta-agl-profile-core
meta-agl-distro
meta-agl-bsp = "HEAD:235b2160ca1e11afeda9f9ed017f715199720756"
meta-security = "HEAD:8f6969a775fa6afbf553e72ba83e71197780b2d8"
meta-perl = "HEAD:eae996301d9c097bcbeb8046f08041dc82bb62f8"
meta-security
meta-app-framework = "HEAD:235b2160ca1e11afeda9f9ed017f715199720756"
meta
meta-poky = "HEAD:68a612b7d31d270348ef5439d7f779c309bdb6ec"