Share subscription : Is there any sharename limitation? Too long sharename

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- [ 1.2.0] Bug exists Release Version 1.2.0 ( Master Branch)

**Environment**
VerneMQ Version: erlio/docker-vernemq:1.7.1-2
Paho Java Client : 1.2.1
OS: UBUNTU 18.04
Erlang/OTP version (if building from source):
VerneMQ configuration (vernemq.conf) or the changes from the default
Cluster size/standalone: 3 nodes

**Expected behavior**
I have a 3 node cluster using docker with network mode host.
The client application had subscribed multiple topics using shared subscriptions.
Actual behavior
$share/rayStatistics/students/#
Here 'rayStatistics' is my sharename.
I have observed that when the name is too long then subscription behavior unpredictable.
Some time Client application receives the message and sometimes not.

I had tried with multiple share name.

$share/test/students/#
Here 'test' is my sharename.
Which is working fine.
So Is there any limitation in sharename?