Strange behaviour with typescript function arguments coming from variable

I have an strange case here using Ionic Angular.

I have a function inside a service with two arguments:

async getTaskById(mobileTaskId: string, pushIntoTaskList?: boolean) {
const task = await this.database.mobileTaskRepository
.createQueryBuilder('task')
.where('task.mobileTaskId = :id', {id: mobileTaskId})
.getOne() || undefined;

if(!task) return undefined;

if(pushIntoTaskList) {
const filterDates = new AmTaskFilterDates();

if(!task.archived) {
if(!task.plannedToDate || new Date(task.plannedToDate) < filterDates.now) {
this.updateTaskList(this.taskListOverdue, this.taskListOverdue$, [task], true).then();
}

if(task.plannedToDate && new Date(task.plannedToDate) >= filterDates.startOfToday && new Date(task.plannedToDate) < filterDates.endOfToday) {
this.updateTaskList(this.taskListToday, this.taskListToday$, [task], true).then();
}

if(task.plannedToDate && new Date(task.plannedToDate) >= filterDates.startOfThisWeek && new Date(task.plannedToDate) < filterDates.endOfThisWeek) {
this.updateTaskList(this.taskListThisWeek, this.taskListThisWeek$, [task], true).then();
}

if(task.plannedToDate && new Date(task.plannedToDate) >= filterDates.endOfThisWeek && new Date(task.plannedToDate) < filterDates.endOfNextWeek) {
this.updateTaskList(this.taskListNextWeek, this.taskListNextWeek$, [task], true).then();
}

if(task.plannedToDate && new Date(task.plannedToDate) >= filterDates.endOfNextWeek) {
this.updateTaskList(this.taskListUpcoming, this.taskListUpcoming$, [task], true).then();
}
} else {
this.updateTaskList(this.taskListArchived, this.taskListArchived$, [task], true).then();
}
}

return task;
}


inside an component I call this function, but here the magic happens.

if I do:

const test = 'test';
await this.mobileTaskService.getTaskById(test, true);


the first param (mobileTaskId) is ignored and the second param is used as mobileTaskId -> pushIntoTaskList gets undefined.

if I do:

await this.mobileTaskService.getTaskById('test', true);


or

await this.mobileTaskService.getTaskById(`${test}`, true);


its working... Does anyone have an idea why this could happen?

here is also a screenshot of my IDE:



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