BytesIO/StringIO break pn.pane.image if called second time

[hoxbro]

ALL software version info

Panel: 0.10.0.post7+gb5cf6928

Description of expected behavior and the observed behavior

When having a BytesIO/StringIO object as input to pn.pane.image it will crash the second time a widget is called.
I don´t know if it a feature or a bug... I have made a simple implementation of a fix, if it is a bug here.

Complete, minimal, self-contained example code that reproduces the issue

import os

import param
import panel as pn


class ImageExample(param.Parameterized):
    def __init__(self, **params):
        self.button = pn.widgets.Button(name="Create Animation", button_type="primary")
        self.break_ = pn.widgets.Button(name="Break Animation", button_type="primary")
        super().__init__(**params)
        self.gif = None

    @param.depends(pn.state.param.busy)
    def animation(self, busy):
        return None if busy else self.gif

    @param.depends("button.clicks")
    def _create_animation(self):
        # it could be any gif... :)
        self.gif = pn.pane.GIF(open(os.path.join(os.path.dirname(__file__),'index.gif'), 'rb'))

    @param.depends("break_.clicks")
    def _break_animation(self):
        pass


ie = ImageExample()
pn.Column(
    ie.button,
    ie.break_,
    ie.animation,
    ie._create_animation,
).servable()

Screenshots or screencasts of the bug in action