`ạ`,`ậ` and `ặ` cannot alternate correctly with `ss01` and `ss05` both on

[lxgw]

When I used OpenType Feature Freezer to freeze ss05 and ss01, the characters ạU+1EA1, ậU+1EAD and ặU+1EB7 didn't apply the double-storey style.

Version: 2.008

[lxgw]

Default:

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Only ss01 on:

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Only ss05 on:

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Both ss01 and ss05 on: