Tailscale Internet is breaking when connecting to exit node

### What is the issue?

Without exit node it is working fine but whenever, I am connecting to exit node from mac mini, internet is not working and ping is failing for all internet ips.

`BUG-ada3581b0229b7255727b6961a9466d0d14d218a5af94481a766219fd4f93cc1-20250420040638Z-0f709c22b762ba8a`

after connecting to exit node -

```
$dig google.com

; <<>> DiG 9.10.6 <<>> google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 28783
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4095
;; QUESTION SECTION:
;google.com. IN A

;; ANSWER SECTION:
google.com. 28 IN A 142.250.199.142

;; Query time: 504 msec
;; SERVER: 100.100.100.100#53(100.100.100.100)
;; WHEN: Sun Apr 20 00:06:10 EDT 2025
;; MSG SIZE rcvd: 55
```

```
$ping 142.250.199.142

PING 142.250.199.142 (142.250.199.142): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
```

```
$curl -v google.com

* Host google.com:80 was resolved.
* IPv6: 2404:6800:4009:82d::200e
* IPv4: 142.250.196.14
* Trying 142.250.196.14:80...
* Trying [2404:6800:4009:82d::200e]:80...
* connect to 2404:6800:4009:82d::200e port 80 from fd7a:115c:a1e0::eb01:2c36 port 65144 failed: Network is unreachable
* connect to 142.250.196.14 port 80 from 100.119.44.54 port 65143 failed: Operation timed out
* Failed to connect to google.com port 80 after 75258 ms: Could not connect to server
* closing connection #0
curl: (28) Failed to connect to google.com port 80 after 75258 ms: Could not connect to server
```

### Steps to reproduce

1. Connect to tailscale
2. Connect to exit node

Client machine - mac mini
Exit node - Ubuntu

### Are there any recent changes that introduced the issue?

No

### OS

macOS

### OS version

_No response_

### Tailscale version

_No response_

### Other software

_No response_

### Bug report

BUG-ada3581b0229b7255727b6961a9466d0d14d218a5af94481a766219fd4f93cc1-20250420040638Z-0f709c22b762ba8a