[MCPE-171001] rawtext %%%%1 cannot be escaped correctly

In general, %%1 can be escaped correctly

{"rawtext":[{"translate":"%%1","with":["hello world"]}]}

The observed result:

> hello world

But when I prepebd %%

{"rawtext":[{"translate":"%%%%1","with":["hello world"]}]}

The observed result:

> %1

The expected result:

> %hello world

I'm pretty sure it's not right because that's not the same as %%%%s

{"rawtext":[{"translate":"%%%%s","with":["hello world"]}]}

The observed result:

> %hello world