[BUG] [Ruby Client]Plural can't use fallback locale when no translation of the requested strings with placeholder.

Describe the bug
Plural can't use fallback locale when no translation of the requested strings with placeholder.
getString_f().to_plural_s()
SgtnClient::T.s_f().to_plural_s()
Notes: New added API supports plurals fallback doesn't has placeholder parameter: getString_p()

To Reproduce
Steps to reproduce the behavior:
plural rule of locale "en":

<pluralRules locales="ast ca de en et fi fy gl ia io ji lij nl sc scn sv sw ur yi">
            <pluralRule count="one">i = 1 and v = 0 @integer 1</pluralRule>
            <pluralRule count="other"> @integer 0, 2~16, 100, 1000, 10000, 100000, 1000000, … @decimal 0.0~1.5, 10.0, 100.0, 1000.0, 10000.0, 100000.0, 1000000.0, …</pluralRule>
        </pluralRules>

plural rule of locale "da"

<pluralRules locales="da">
            <pluralRule count="one">n = 1 or t != 0 and i = 0,1 @integer 1 @decimal 0.1~1.6</pluralRule>
            <pluralRule count="other"> @integer 0, 2~16, 100, 1000, 10000, 100000, 1000000, … @decimal 0.0, 2.0~3.4, 10.0, 100.0, 1000.0, 10000.0, 100000.0, 1000000.0, …</pluralRule>
        </pluralRules>

string in source default.yml file:

pluralsstrArg: "%%%%<{ \"cat_count\": { \"one\": \"there is one cat in %2$s and %1$s room\", \"other\": \"there are %%%%{cat_count} cats in %2$s and %1$s room\" } }>"
pluralsstrNamedArg: "%<{ \"cat_count\": { \"one\": \"there is one cat in {A2} and {A1} room\", \"other\": \"there are %{cat_count} cats in {A2} and {A1} room\" } }>"

Method in .rb file:

@DA_Result_one_1dot6_Arg_fallback_EN_other = SgtnClient::Translation.getString_f("JAVA", "pluralsstrArg", ["a1","a2"],"da").to_plural_s("da", { :cat_count => 1.6 })
@DA_Result_one_1dot6_NamedArg_fallback_EN_other = SgtnClient::Translation.getString_f("JAVA", "pluralsstrNamedArg", {"A1": "a1", "A2": "a2"}, "da").to_plural_s("da", { :cat_count => 1.6 })
RequestStore.store[:locale] = 'da'
RequestStore.store[:component] = 'JAVA'
@DA_Result_one_1dot6_Arg_EN_other_T = SgtnClient::T.s_f("pluralsstrArg", ["a1","a2"]).to_plural_s("da", { :cat_count =>1.6 })
Arg = {"A1": "a1", "A2": "a2"}
@DA_Result_one_1dot6_NamedArg_EN_other_T =  SgtnClient::T.s_f("pluralsstrNamedArg", Arg).to_plural_s("da", { :cat_count => 1.6 })

Actual behavior
Translation returns to default.yml(EN source), but plurals still use DA's.
@DA_Result_one_1dot6_Arg_fallback_EN_other: s_there is one cat in a2 and a1 room
@DA_Result_one_1dot6_NamedArg_fallback_EN_other: s_there is one cat in a2 and a1 room
@DA_Result_one_1dot6_Arg_EN_other_T: there is one cat in a2 and a1 room
@DA_Result_one_1dot6_NamedArg_EN_other_T: there is one cat in a2 and a1 room

Expected behavior
Translation returns to default.yml(EN source), plurals should use EN's as well.
@DA_Result_one_1dot6_Arg_fallback_EN_other: there are 1.6 cats in a2 and a1 room
@DA_Result_one_1dot6_NamedArg_fallback_EN_other: there are 1.6 cats in a2 and a1 room
@DA_Result_one_1dot6_Arg_EN_other_T: there are 1.6 cats in a2 and a1 room
@DA_Result_one_1dot6_NamedArg_EN_other_T: there are 1.6 cats in a2 and a1 room