Unable to change transparency on TileOverlay on Android

I'm migrating from the kefahB/nativescript-google-maps plugin to @nativescript/google-maps.
My app animates weather radar by composing an array of TileOverlays and then iteratively changing the TileOverlay's transparency to hide one overlay and display the next.

While transparency can be specified in the TileOverlayOptions when creating a TileOverlay, it can't be modified directly afterwards. Instead, you have to use native methods, such as on iOS:

tileOverlay.native.opacity = 1.0;  // display tileOverlay

On Android, there's:

tileOverlay.native.setTransparency(0.0);  // display tileOverlay

But this seems to have no effect. I can see in the debugger and via tileOverlay.native.getTransparency() that the native TileOverlay's transparency property has indeed been changed, but there is no change in the display.

從透過 tileOverlay.native 暴露的 Android TileOverlay 實作開始，追蹤 TileOverlayOptions 中的 setTransparency 以及 transparency。在 Android 上重現雷達疊加層的更新，並驗證建立後變更 transparency 會改變算繪出的疊加層。