[1.9] External template not registering components anymore

[Tofandel]

I import external templates like

<template src="./templates/TextTemplate.html"></template>

Which contains

<v-text-field type="text"
              :label="translatedLabel"
              v-model="vModel"
              v-bind="bind" v-on="listeners">
    <!-- Pass on all named slots -->
    <slot v-for="slot in Object.keys($slots)" :name="slot" :slot="slot"></slot>

    <!-- Pass on all scoped slots -->
    <template v-for="slot in Object.keys($scopedSlots)" :slot="slot" slot-scope="scope">
        <slot :name="slot" v-bind="scope"></slot>
    </template>
</v-text-field>

In 1.8 it worked properly, in 1.9 it doesn't resolve the v-text-field component and just outputs it as is

If I use the template directly, it works correctly