Snippets modify error in Static Pages (OctoberCMS)

Question

I've created a plugin that can add different content (text, map, etc.). I have registered Snippet in the plugin.

Plugin.php

...
public function registerComponents() {
    return [
        'Author\Contents\Components\Text' => 'textContent'
    ];
}

public function registerPageSnippets() {
    return [
        'Author\Contents\Components\Text' => 'textContent'
    ];
}
...

I created a text type component that created two properties (contentID [selector of existing text content], showTitle [selector, true or false]).

components/Text.php

...
public function defineProperties() {
    return [
        "contentId" => [
            "title" => "Select content",
            "type" => "dropdown",
            "placeholder" => "Please select a content..."
        ],
        "showTitle" => [
            "title" => "Show content title",
            "type" => "dropdown"
        ]
    ];
}

public function getContentIdOptions() {
    return Texts::orderBy("title")->lists("title", "id");
}

public function getShowTitleOptions() {
    return [
        "hide" => "No",
        "show" => "Yes"
    ];
}
...
public function onRender() {
    $this->contentData = $this->page["contentData"] = Texts::find($this->property("contentId"));

    foreach ($this->getProperties() as $key => $value) {
        $this->page[$key] = $value;
    }
}

components/text/default.htm

{{ showTitle }}
{{ __SELF__ }}

<div class="row">
    <div class="col-12">
        {{ contentData.content|raw }}
    </div>
</div>

When I try to insert a snippet to a page (in Static Pages plugin), it works perfectly. However, if I change the code snippet settings (for example, I change the showTitle property value from true to false), the content does not appear in the front-end page. If I change anything compared to the created state, the content will disappear. Even if that property is not included in the code.

If I do not modify the property used when inserting, it generates html. However, if I change, I see this in the inspector:

<figure data-component="Author\Contents\Components\Text" data-inspector-id="inspectorid-984837527907" data-property-contentid="6" data-property-showtitle="show" data-snippet="textContent">&nbsp;</figure>

Interestingly, the snippet of the Rjgallery plugin does not work, it does not load the content either.

EDIT

If I wait for a few minutes after the change, the changes will take effect. Probably a cache... How to take shorter time?

What is the reason of this?