Calling hide() and show() causes sdMainFabClosedSrc and sdMainFabOpenSrc disappear. (support lib 28.0.0)

Step 1: Are you in the right place?

• I have verified there are no duplicate active or recent bugs, questions, or requests
• I have verified that I am using the latest version of the library.

Step 2: Describe your environment

• Library version: 1.0.2
• Android version: 27
• Support library version: 28.0.0-alpha3
• Device brand: Google
• Device model: Pixel XL

Step 3: Describe the problem:

Steps to reproduce:

1. call hide() to hide the SpeedDialView.
2. call show() to show it.
3. click on the SpeedDialView to open the menu, observe that A.
4. click on the SpeedDialView's main fab to close the menu, observe that B.

Observed Results:

• A. the main fab's open icon is gone.
• B. the main fab's closed icon is also gone.

Expected Results:

• the main fab's open icon should be visible.
• the main fab's closed icon should be visible.

Screenshots:

Notice that the menu's smaller fabs do have the icon correctly set.

Reproduce the issue on Android 27 with library 1.0.2 and support library 28.0.0-alpha3 by calling hide(), show(), and opening and closing the SpeedDialView. Trace the main FAB's open and closed icon state around those calls; done means both icons remain visible after the menu is opened and closed.